Question
If $\frac{\vec{a} \cdot \vec{b}}{|\vec{a}| \cdot |\vec{b}|} = 1$, then the angle between $\vec{a}$ and $\vec{b}$ is:
If $\frac{\vec{a} \cdot \vec{b}}{|\vec{a}| \cdot |\vec{b}|} = 1$, then the angle between $\vec{a}$ and $\vec{b}$ is: